Index: tool/sqldiff.c
==================================================================
--- tool/sqldiff.c
+++ tool/sqldiff.c
@@ -1300,11 +1300,11 @@
       }
     }else{
       char *zOtaControl;
       int nOtaControl = sqlite3_column_bytes(pStmt, nCol);
 
-      zOtaControl = (char*)sqlite3_malloc(nOtaControl);
+      zOtaControl = (char*)sqlite3_malloc(nOtaControl+1);
       memcpy(zOtaControl, sqlite3_column_text(pStmt, nCol), nOtaControl+1);
 
       for(i=0; i<nCol; i++){
         int bDone = 0;
         if( i>=nPK